linux-kernel - Re: [PATCH 8/9] vfio/pci: use x86 naming instead of igd

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Date:   Thu, 11 Feb 2021 18:39:24 +0100
From:   Cornelia Huck <cohuck@...hat.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>
Cc:     Max Gurtovoy <mgurtovoy@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        liranl@...dia.com, oren@...dia.com, tzahio@...dia.com,
        leonro@...dia.com, yarong@...dia.com, aviadye@...dia.com,
        shahafs@...dia.com, artemp@...dia.com, kwankhede@...dia.com,
        ACurrid@...dia.com, gmataev@...dia.com, cjia@...dia.com,
        yishaih@...dia.com, aik@...abs.ru
Subject: Re: [PATCH 8/9] vfio/pci: use x86 naming instead of igd

On Thu, 11 Feb 2021 11:29:37 -0500
Matthew Rosato <mjrosato@...ux.ibm.com> wrote:

> On 2/11/21 10:47 AM, Max Gurtovoy wrote:
> > 
> > On 2/2/2021 7:10 PM, Jason Gunthorpe wrote:  
> >> On Tue, Feb 02, 2021 at 05:06:59PM +0100, Cornelia Huck wrote:
> >>  
> >>> On the other side, we have the zdev support, which both requires s390
> >>> and applies to any pci device on s390.  
> >> Is there a reason why CONFIG_VFIO_PCI_ZDEV exists? Why not just always
> >> return the s390 specific data in VFIO_DEVICE_GET_INFO if running on
> >> s390?
> >>
> >> It would be like returning data from ACPI on other platforms.  
> > 
> > Agree.
> > 
> > all agree that I remove it ?  
> 
> I did some archives digging on the discussions around 
> CONFIG_VFIO_PCI_ZDEV and whether we should/should not have a Kconfig 
> switch around this; it was something that was carried over various 
> attempts to get the zdev support upstream, but I can't really find (or 
> think of) a compelling reason that a Kconfig switch must be kept for it. 
>   The bottom line is if you're on s390, you really want zdev support.
> 
> So: I don't have an objection so long as the net result is that 
> vfio_pci_zdev.o is always built in to vfio-pci(-core) for s390.

Yes, I also don't expect presence of the zdev stuff to confuse any
older userspace.

So, let's just drop CONFIG_VFIO_PCI_ZDEV and use CONFIG_S390 in lieu of
it (not changing the file name).